thomas



JAMES il. THOMAS, OF-LACON, ILLINOIS.

Letters Patent 76,118, dated JlImct'Sl, 1868.

IMPROVED BooK-DRILL.

@he rlithitlt rtftttrh tu in tlgttt ttitttt rttnt mit mating pnt nftlg smut.

To ALL WHoM rr MAY coNoERN:

Be it known that I, JAMES H. THOMAS, of Lacon, in the county o`- Marshall,and State of Illinois, have invented a newvand useful Improvement in Operating Rock-Drills, and in steam cutoi; und I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference b eing had to the accompanying drawings forming part of this specification.

This invention-relates to a new and improved method-of operating a rock-drill, and to the manner in which tbesteam-engine portsA are opened and closed; and it consists, rst, in the manner in which thedrill is attached `to and operated bythe cross-head of' the engine; secondly, inthe rnanner in whichthe drill is held and revolved; and thirdly, in the construction and opera-tion of the steam-valves.

Figure 1 represents a side elevation of the engine, with the drill and the parts connected with them.

Figure 2 is a top View of the same. i

Figure 3 is a sectional elevation 'through the'lihe a: of fig. 2.

Figure 4 is ahorizontal section on -the line z/ y of hg. 3.

Figure 5 is a horizontal section on the line z z of hg.- 3.

Figure 6 is a section of iig. 4, through the liner Similar letters of reference indicate like parts. v

This steam-drill is attached to a cylindrical piece of wood or metal, which is supported by suitablelegs ror posts, and which is represent-ed in the drawing by A. When' the drill is attached in the manner represented, it can be adjusted to drill holes at any desired angle."A B is the steam-engine cylinder, containing a piston with piston-rod, in the usualv manner. C is the piston, and C" the piston-rod. D'is the drill. E is a tube-casing, through which the drill passes. F is the cross-head of the engine, to which the drill-tube E isatitached. G is the steam-chest. a a, iig. 3, are the valves in the steam-chest.' b b are the steam-ports. I

- The top of the inachine, (represented in iig. 2,) is a plate, which is suportedby rods from the head of the cylinder. The piston-rod and the drill-tubepass up through this plate, which is marked H. The drill-tube is continedjo the edge of thisiplate by a clamp and stirrup, and it is confined to the head ofthe cylinders in the same;

manner, but'in the latter case there isa divided band, 7L, attached to the cylinder and to the clamp, a portion ofthe band being on each. i

`c e, hg. 4, are two plates, which are attached to the tube E. Between these plates are placed two cams Z d, (a side View of which isvseen in iig. 6,) the inner ends of which act on the drill through slots inthe tube, by pieces markedff, which hang from the ratchet-wheel, as seen in fig. 6. The ratchet g is coniined to the crosshead ofthe engine, and moves up and down' with it, as does the tube E. The ratchet is revolved between two plates, and it is s6 clamped to the tube that the tube and drillrevolve with it. The object is to revolve the drill when it is at work in theNrock. The ratchet is revolved by a spring-pawl, marked z', (seen in fig. 5,) which is crowded forward as it is moved up and down on the cross-head by an inclined rod, seen in iigs. 1 and 3, marked J. The drill :indy the drill-tube work with the cross-head up and down, and the drill is conned by the cams operating against the piecesf. In descending, the cams strike the rim of the band 7a, andthe outer-ends are thereby thrown up, which relieves the drill of pressure. The outer portion of the band L is hinged, as seen in g. 4, andis held in place by the stirrup 7c. The clamp und vstirrup, which confine the upper end of the drill and drill-tube, are seen in tig. 2, marked hz and u. The steam-chest G is a plain cylinder, with a rod, o, which has two piston-valves a a, upon it, as seen in section, tig. 3. 'lhcrod passes up through the plate H, and it is operated by the cross-head F. Above and below the cross-head there are screw-nuts placed on the rod,with which the eross-hcadicomes in contact. These nuts are seen atppr` Coil-springs o r are placed above and below the cross-head, which act against the nuts, and which serve to break the concussion or forceof the blow.- The piston-valves a o: pass above and below the ports' b. AThe stearo is admitted between them through the pipe S.Y It 'will consequently be seen that the valves are balanced, the pressure being the saure upon each.

As represented in iig. 3, the cylinder is taking steam above the piston or in the upper en d of the cylinder, and exhausting it from its lower end. When the valves are forced down, the operation is reversed, and so on alternately. v

What'Irclaim as new, and desire to secure by Letters Patent, is-

1. The tube EQhaviug the drill DLWhen seeui'ed to the cross-hendF, upon ene side, by means of the ratchetwheel g,'ttiug between the horizontal plates, the clumps m n, upon the plete II`a.nd the bund h uponY the cylinder-head, as herein descrbetlfor the purpose specified.

2. The combination, with the drill D and' tube E, of the plates 0.a, cams d (Z, piecesfflfupellet-wheel g, springv pmvl z' nml inclined rocl J and bund h, urianged and pernt-ing substantially as described.

JAMES H. THOMAS.

Witnesses:

W. E. PHILLIPS, D. C'. WALLACE.' 

